Power amplifier
AssigneeMurata Manufacturing Co., Ltd.
InventorKiichiro TAKENAKA
Life of this patent
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Abstract
A power amplifier includes a power splitter that splits a first signal into a second signal and a third signal, a first amplifier that amplifies the second signal within an area where the first signal has a power level greater than or equal to a first level and that outputs a fourth signal, a second amplifier that amplifies the third signal within an area where the first signal has a power level greater than or equal to a second level higher than the first level and that outputs a fifth signal, an output unit that outputs an amplified signal of the first signal, a first and a second LC parallel resonant circuit, and a choke inductor having an end to which a power supply voltage is supplied and another end connected to a node of the first and second LC parallel resonant circuits.
Claims11
A power amplifier comprising:
- a power splitter configured to split a first signal into a second signal and a third signal, the third signal being delayed by approximately 90 degrees with respect to the second signal;
- a first amplifier configured to amplify the second signal when the first signal has a power level greater than or equal to a first level, and configured to output a fourth signal;
- a second amplifier configured to amplify the third signal when the first signal has a power level greater than or equal to a second level, and configured to output a fifth signal, wherein the second level is greater than the first level;
- an output circuit configured to output an amplified signal of the first signal based on the fourth and fifth signals;
- first and a second LC parallel resonant circuits connected in series between an output terminal of the first amplifier and an output terminal of the second amplifier;
- and
- a choke inductor having an end to which a power supply voltage is supplied and another end connected to a node between the first and second LC parallel resonant circuits, wherein:
- the first LC parallel resonant circuit has a resonant frequency that is approximately an integer multiple of a frequency of the first signal, and
- the second LC parallel resonant circuit has a resonant frequency that is approximately an integer multiple of the frequency of the first signal.
Dependencies are inferred from the claim text.